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<h1>About binary contents files
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<p>You can reduce the time it takes to load a very large table of contents by <a href="cntbin.htm">creating a binary contents file</a>. A binary table of contents is populated based on user demand. For example, in a table of contents where a book is located within another book, the second level book will not be populated until a user clicks it. 
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<p>The binary format, however, has a very limited set of authoring features. For example:

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	<li>Only book and page icons are supported. 
	<li>Custom icons are not supported. 
	<li>Information types are not supported.
	<li>You cannot author a table of contents link to open a topic in a default window or default frame.
	<li>You cannot modify window styles.
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<tr> <td valign="top"><a href="overlrg.htm"><img src="home.gif" alt="Home page link" border="0"></a>
</td><td><a href="overlrg.htm">About managing large document sets</A>
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